Method for preparing polycarbonate with continuous two-phase interface phosgene method

A polycarbonate and phase interface technology, which is applied in the field of continuous two-phase interface phosgene method to prepare polycarbonate, can solve the problems of complex process, increase the difficulty of the preparation process, large consumption of phosgene and lye, etc., and achieve simplified process control Steps, reducing phosgene alkali hydrolysis rate and lye supplementation, reducing the effect of unit consumption

Active Publication Date: 2012-04-25
WANHUA CHEM GRP CO LTD +1
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  • Abstract
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Problems solved by technology

The phosgene organic phase and the phenoxide salt phase are mixed by a static mixer and then quickly entered into a continuous stirring full-mixed tank reactor, and the excess ratio of phosgene is reduced to 10.2~ 14%, but the process is complicated, and in order to control the end group equivalent ratio of the oligomer emulsion in the fully mixed tank, the molar equivalent ratio of the alkali metal hydroxide introduced in the photochemical reaction stage to the functional group of bisphenol has reached 1.1 ~1.5
[0010] In summary, in order to ensure the molecular weight of the final product in the existing two-step process for preparing polycarbonate by interfacial phosgene method, it is necessary to strictly control the chloroformate end in the polycarbonate oligomer emulsion in the photochemical reaction stage. The equivalent ratio of phosgene and phenolic oxyanion terminal groups is slightly higher than 1, so it is necessary to control the main reaction of phosgene and bisphenol in the photochemical reaction stage, which not only increases the difficulty of the preparation process, but also causes photochemical reaction. Large consumption of gas and lye

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  • Method for preparing polycarbonate with continuous two-phase interface phosgene method

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Experimental program
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Embodiment 1

[0049] In a mixing tank, 1801 g of bisphenol A, 9558 g of water and 660 g of sodium hydroxide were added to mix and dissolve to form a sodium phenolate brine phase; in another mixing tank, 850 g of liquid phosgene and 13203 g of methylene chloride were added to form an organic phase. The sodium phenolate brine phase and the organic phase, which account for 99% of the total bisphenol A sodium brine phase, are fed into the photochemical reactor composed of a static mixer at a flow rate of 397g / min and 468g / min respectively, and enter after staying for 1.5min. In a coupling reactor that is also composed of a static mixer, the remaining amount of sodium phenolate brine phase and a capping agent with a concentration of 5 wt% are injected into the reactor at the same time, and the capping agent is p-tert-butylphenol Dichloromethane solution, a catalyst with a concentration of 1.5wt%, the catalyst is a dichloromethane solution of triethylamine and a sodium hydroxide solution with a con...

Embodiment 2

[0051] In a mixing tank, 1802g of bisphenol A, 9560g of water and 660g of sodium hydroxide were added to mix and dissolve to form a sodium phenolate brine phase; in another mixing tank, 850g of liquid phosgene and 13205g of methylene chloride were added to form an organic phase. The sodium phenolate brine phase and the organic phase, which account for 99.5% of the total bisphenol A sodium brine phase, are fed into the photochemical reactor composed of static mixers at the flow rates of 399g / min and 468g / min respectively, and enter after staying for 1.5 minutes. In the coupling reactor, which is also composed of a static mixer, the remaining amount of sodium phenolate brine phase, 5% mass fraction of p-tert-butylphenol / dichloromethane solution, 1.5% mass fraction of the Fractions of catalyst triethylamine / dichloromethane solution and 30% mass fraction of sodium hydroxide solution, the flow rates of the four are respectively 2g / min, 12.8g / min, 7g / min, 11g / min, and the reaction is ...

Embodiment 3

[0053] In a mixing tank, 1802 g of bisphenol A, 9559 g of water and 660 g of sodium hydroxide were added to mix and dissolve to form a sodium phenolate brine phase; in another mixing tank, 849 g of liquid phosgene and 13202 g of methylene chloride were added to form an organic phase. The sodium phenolate brine phase and the organic phase, which account for 95% of the total bisphenol A sodium brine phase, are fed into the photochemical reactor composed of static mixer at flow rates of 381g / min and 468g / min respectively, and enter after staying for 1.5min. In the coupling reactor, which is also composed of a static mixer, the remaining amount of sodium phenolate brine phase, 5% mass fraction of p-tert-butylphenol / dichloromethane solution, 1.5% mass fraction of the Fractions of catalyst triethylamine / dichloromethane solution and 30% mass fraction of sodium hydroxide solution, the flow rates of the four are 20g / min, 12.8g / min, 7g / min, 11g / min, and the reaction is 15min. The reactio...

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Abstract

The invention relates to a novel method for preparing polycarbonate with a continuous two-phase interface phosgene method, comprising the following steps: carrying out photochemical reaction on alkali metal hydroxide solution and organic phase to prepare polycarbonate oligomer emulsion, wherein bisphenol or polyphenol or mixture of the bisphenol and the polyphenol is dissolved in the alkali metalhydroxide solution, the alkali metal hydroxide solution accounts for 95-99.5 percent of the weight in the formula, and the organic phase contains phosgene; and carrying out coupling reaction on the polycarbonate oligomer emulsion and the residual alkali metal hydroxide solution to finally prepare polycarbonate resin. The method for preparing the polycarbonate with the continuous two-phase interface phosgene method is simpler in process than the existing method for preparing the polycarbonate, and the loss of the phosgene and the alkali liquor is reduced effectively.

Description

Technical field [0001] The invention relates to a continuous production method of polycarbonate, and more specifically to a method for preparing polycarbonate by a continuous two-phase interface phosgene method. Background technique [0002] Polycarbonate (PC) has outstanding impact resistance, creep resistance, high tensile strength, flexural strength, elongation and rigidity, can withstand the explosion of TV screens, and has high resistance Thermal and cold resistance, it can be used in the range of -100℃~140℃, excellent electrical performance, low water absorption, good light transmittance, visible light transmittance up to about 90%, and any coloring can be applied. At present, the large-scale industrial production is mainly aromatic polycarbonate, which is the second largest engineering plastic in the world after nylon. It has a wide range of uses in the national economy and has entered automobiles, electronic and electrical, construction, office equipment, packaging , Spo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/24
Inventor 张雷张宏科宋林嵘华卫琦徐超乔石张振威潘勇军胡亦锋杨径靖臧西旺冯凯
Owner WANHUA CHEM GRP CO LTD
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